“guns of naverone”, exactly! those guns were not just artillery. they were much larger, they were heavy duty concrete formations with high caliber machine gunners all over them. they could not be redirected from the sea. the western coast of france is not your average place on the map and i believe require special considerations, especially if your into realism. the rule is not complicated. just -1 to all attcking forces and blockhouses fire preemptively ever round of combat till destroyed. there is already rules for fortifications, these are just on steroids, kind of like super battleships. there are rules for us atomic weapons, which basically could decide the game. if this stuff was not in place in western france the allies would have walked right in basically. this battle was so important and historic its even got its own holiday and A+A game. blockhouses add alittle flavor of this into a global game. consider playtesting it. its great! ya know how long it took to try to get the hang of your 12d system. now it looks like with your global 39 game im going to be going back to 6d(thank god). just playtest my blockhouses, im telling you,you will love it!